code: def add_floating_axis1(ax):
      ax.axis["lat"] = axis = ax.new_floating_axis(0, 30)
      axis.label.set_text(r"$\theta = 30^{\circ}$")
      axis.label.set_visible(True)
      return axis
  
file_path: matplotlib/galleries/examples/axisartist/demo_axis_direction.py
imports: import matplotlib.pyplot
  import numpy
  from matplotlib.projections import PolarAxes
  from matplotlib.transforms import Affine2D
  import mpl_toolkits.axisartist
  import mpl_toolkits.axisartist.angle_helper
  import mpl_toolkits.axisartist.grid_finder
  from mpl_toolkits.axisartist.grid_helper_curvelinear import GridHelperCurveLinear
label_desc: Use image node_id 2 for calling a global function with example usage: add_floating_axis1(ax) and returns: axis